James E. Lawler

Alterations in cardiac contractility during classical aversive conditioning in dogs: methodological and theoretical implications.

J. Lawler, P. Obrist, J. L. Howard, 1972, Psychophysiology.

Sympathetic influences on cardiac rate and contractility during acute stress in humans.

J. Lawler, P. Obrist, J. L. Howard, 1974, Psychophysiology.